I generally do this with the client after a walk through of the needs and desired result of the production. I make an outline of our conversation and then take out my "storyboard. A storyboard in nothing more than pages with what looks like empty TV screens on them, generally three to a page. The screens are on the right of the page and I have a column of scripting lines on the left side of the page across from the "screens. I first establish the words for the script on the left then in the screen on the right I draw what I perceive as the "action". You don't have to be Norman Rockwell to draw what you want. Stick figures work for me. Within the boxes I can draw in a primary shot, on the next, a close up of work being done, whatever the script calls for. When it is time to change the scene I place a dissolve in the next box and proceed to the next scene. This gives me a "road map" for the future edition processes i will have to do as well as a logical map for the scripting that follows it.
The editing process takes a bunch of time that many client don't understand. Having a storyboard cuts the time down and also eliminates un-shot scenes that are in the script. The editing requires a very long time trimming the shots to get them to fit the script, sometimes adjustments to lighting and color balances, and of course any text that needs to be added to the video. It really sucks up the time.
Sometimes music or narration needs to be added which takes a bit more of a challenge. Any recorded music is copyright protected such as music on albums, Pandora, virtually any source. I am very lucky as I have two very talented musician nephews that create my original sounds for my videos, Tim and Andy Putnam. They are true lifesavers and both located in Nashville.
The narration is another issue that needs to be solved. I generally will go to a radio station and have the "voice" record the audio there and then edit it in my studio. In the editing process there is a "timeline" that visually lays down the sequences of the scenes on the computer screen as well as the audio lines below it. I can then place the narration where it needs to go as well as the music which is on another line below the audio. On these lines I can also vary the volume of both lines as is appropriate for the situation.
The Final edit
The final edit is critical to the success of the video. In this stage you can tighten up the production and shorten sequences if necessary, and add time if needed to spots in the sequences. I have found that any video for commercial clients, generally speaking, a three to four minute duration is about the max you can hold an audience. Of course this isn't a solid rule all of the time. The longest video I've produced was for a Hospital which ran two storylines concerning patient successes within the hospital which lasted 14 minutes. Hugely successful video, the audience loved it. I produced one for the city of Carthage, Mo. that was 11 minutes long and took a year to produce as we covered the town in four seasons. A very fun video which won an First Place award at a National Chamber of Commerce meeting in Orlando Florida.